slope intercept form & graphing definition - intercepts x-intercept y-intercept back the...
Post on 18-Dec-2015
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Definition - Intercepts
x-intercept
y-intercept
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• The x-intercept of a straight line is the x-coordinate of the point where the graph crosses the x-axis.
• The y-intercept of a straight line is the y-coordinate of the point where the graph crosses the y-axis.
x
y
Slope is Rise over Run.
• The numerator tells you to go up or down Positive = Up, Negative = Down.
•The denominator tells you how far to run left or right. Positive = Right, Negative = Left.
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Changing equations to the form y = mx + b
•When equations are in the form ax + by = c, then you need to change them to y = mx + b
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Parallel Lines
43 xy23 xy
Same or different
The equations of two parallel lines have the same slope, but two different y-intercepts.
What if there is no constant?
• If you have a problem like: y = 3x
• You can add a zero, “+ 0”, to the equation without changing the value.
03 xyBACK
Hints• If y = x + 3,the coefficient of x is
1, so the slope is 1/1.• If you do not have room to graph
a slope of 2/1 you can use the equivalent fraction -2/-1
intercept""0 yy
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